This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

"An error occurred while sending mail. The mail server responded: 5.7.1 We were unable to deliver your message."

  • 8 tontu
  • 1 am na jafe-jafe bii
  • 8 views
  • i mujjee tontu mooy skyrock

more options

I'm getting the following error message: "An error occurred while sending mail. The mail server responded: 5.7.1 We were unable to deliver your message. Please try resending your message by adding some text.. Please check the message and try again." 1) I'm using a distribution list that I've used before. 2) The above error message appears when I've added three new names to the list. 3) The new names are valid (i.e. I can send & receive email with them). 4) The distribution works again when I remove the email addresses. 5) The count of email names when the list works is about 100. 6) I've contacted Yahoo/Frontier email support, and they tell me the problem isn't on their end. HELP! Mike

I'm getting the following error message: "An error occurred while sending mail. The mail server responded: 5.7.1 We were unable to deliver your message. Please try resending your message by adding some text.. Please check the message and try again." 1) I'm using a distribution list that I've used before. 2) The above error message appears when I've added three new names to the list. 3) The new names are valid (i.e. I can send & receive email with them). 4) The distribution works again when I remove the email addresses. 5) The count of email names when the list works is about 100. 6) I've contacted Yahoo/Frontier email support, and they tell me the problem isn't on their end. HELP! Mike

All Replies (8)

more options

As the message is from their server, the problem is on their end. You may have hit a limit imposed by Yahoo/Frontier. You'll have to ask them about it though.

more options

That was pointed out to them, but they still said that it was from Mozilla/Thunderbird's side. If it isn't, can you give me some more info to ask them? Thank you.

more options

Please post the entire error message.

more options

christ1 said

Please post the entire error message.

"An error occurred while sending mail. The mail server responded: 5.7.1 We were unable to deliver your message. Please try resending your message by adding some text.. Please check the message and try again." The subject line and message both had text. Also, the error message didn't appear until Thunderbird presented the "email sent" box.

skyrock moo ko soppali ci

more options

See http://kb.mozillazine.org/5.7.1_Unable_to_relay

Presumably you're using your ISPs email service, and they require you to connect to the Internet through them. Is that the case for you?

more options

christ1 said

See http://kb.mozillazine.org/5.7.1_Unable_to_relay Presumably you're using your ISPs email service, and they require you to connect to the Internet through them. Is that the case for you?

Yes, but the only time I have any problem is when my distribution list gets to be about 100 addresses.

skyrock moo ko soppali ci

more options

Well, as said before, the error message is from their server, and they should be able to tell you what's wrong, or what limit you hit.

more options

Thanks. I'll try again.